edu.stanford.nlp.naturalli

Class Polarity

java.lang.Object

edu.stanford.nlp.naturalli.Polarity

public class Polarity
extends Object

A class intended to be attached to a lexical item, determining what mutations are valid on it while maintaining valid Natural Logic inference.

Author:

Gabor Angeli

Constructor Summary

Constructors

Modifier	Constructor and Description
	Polarity(byte[] projectionFunction) Create a polarity item by directly copying the projection function from NaturalLogicRelations to their projected relation.
protected	Polarity(List<Pair<Monotonicity,MonotonicityType>> operatorsInNarrowingScopeOrder) Create a polarity from a list of operators in scope

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
int	hashCode()
boolean	introducesNegation(NaturalLogicRelation lexicalRelation) If true, applying this lexical relation to this word creates a sentence which is negated by the original sentence Note that both this, and maintainsEntailment(NaturalLogicRelation)} can be false.
boolean	isDownwards() Ignoring exclusion, determine if this word has downward polarity.
boolean	isUpwards() Ignoring exclusion, determine if this word has upward polarity.
boolean	maintainsEntailment(NaturalLogicRelation lexicalRelation) If true, applying this lexical relation to this word creates a sentence which is entailed by the original sentence, Note that both this, and introducesNegation(NaturalLogicRelation) can be false.
NaturalLogicRelation	projectLexicalRelation(NaturalLogicRelation lexicalRelation) Project the given natural logic lexical relation on this word.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Polarity

protected Polarity(List<Pair<Monotonicity,MonotonicityType>> operatorsInNarrowingScopeOrder)

Create a polarity from a list of operators in scope

Polarity

public Polarity(byte[] projectionFunction)

Create a polarity item by directly copying the projection function from NaturalLogicRelations to their projected relation.

Method Detail

projectLexicalRelation

public NaturalLogicRelation projectLexicalRelation(NaturalLogicRelation lexicalRelation)

Project the given natural logic lexical relation on this word. So, for example, if we want to go up the Hypernymy hierarchy (NaturalLogicRelation.FORWARD_ENTAILMENT) on this word, then this function will tell you what relation holds between the new mutated fact and this fact.

Parameters:

lexicalRelation - The lexical relation we are applying to this word.

Returns:

The relation between the mutated sentence and the original sentence.

maintainsEntailment

public boolean maintainsEntailment(NaturalLogicRelation lexicalRelation)

If true, applying this lexical relation to this word creates a sentence which is entailed by the original sentence, Note that both this, and introducesNegation(NaturalLogicRelation) can be false. If this is the case, then natural logic can neither verify nor disprove this mutation.

introducesNegation

public boolean introducesNegation(NaturalLogicRelation lexicalRelation)

If true, applying this lexical relation to this word creates a sentence which is negated by the original sentence Note that both this, and maintainsEntailment(NaturalLogicRelation)} can be false. If this is the case, then natural logic can neither verify nor disprove this mutation.

isUpwards

public boolean isUpwards()

Ignoring exclusion, determine if this word has upward polarity.

isDownwards

public boolean isDownwards()

Ignoring exclusion, determine if this word has downward polarity.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object